Physics, 25.08.2020 23:01 ktie9614

Se deja caer una pelota inicialmente en reposo desde una altura de 50m sobre el nivel del suelo. ¿cuanto tiempo requiere para llegar al suelo? ¿cual sera la rapidez de la pelota justo en el momento anterior del choque ?

Answers: 1

Show answers

Answers

Answer from: SoccerHalo

a) t = 3.2 s

b) $v_{f} = -32 m/s$

Explanation:

a) El tiempo requerido para llegar al suelo se puede calcular usando la siguiente fórmula:

$t = \sqrt{\frac{2y_{0}}{g}}$

En donde:

$y_{0}$ : es la altura inicial = 50 m

g: es la gravedad = 10 m/s²

$t = \sqrt{\frac{2y_{0}}{g}} = \sqrt{\frac{2*50 m}{10 m/s^{2}}} = 3.2 s$

Entonces, el tiempo requerido para llegar al suelo es 3.2 s.

b) La rapidez de la pelota justo antes del choque es el siguiente:

$v_{f} = v_{0} - gt$

En donde:

$v_{0}$ : es la velocidad inicial = 0 (dado que se deja caer en resposo)

$v_{f} = v_{0} - gt = 0 - 10 m/s^{2}*3.2 s = -32 m/s$

Por lo tanto, la rapidez de la pelota justo en el momento anterior del choque es -32 m/s (el signo negativo es porque la pelota está cayendo).

Espero que te sea de utilidad!

Answer from: Quest

47r7eudueueueurudueu37373

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Another question on Physics

Physics, 21.06.2019 17:50

Frost wedging occurs when water seeps into a crack in a rock, freezes, and causes the crack in the rock to widen. t or f

Answers: 1

Answer

Physics, 22.06.2019 06:30

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

Answers: 2

Answer

Physics, 22.06.2019 19:10

Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length (in m) of a column of water 1.45 km high for a temperature increase of 1.12°c. assume the column is not free to expand sideways. as a model of the ocean, that is a reasonable approximation, as only parts of the ocean very close to

Answers: 3

Answer

Physics, 22.06.2019 19:50

State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory

Answers: 1

Answer

You know the right answer?

Se deja caer una pelota inicialmente en reposo desde una altura de 50m sobre el nivel del suelo. ¿cu...

Questions